You have two different lessons that both cover regions and states. One says to use "en/au/aux" and the other says "en/dans l'/dans le." (I'm simplifying just to point out where they differ -- there's more info than that, but other than that they don't clash.)
The article that includes "counties" in the title doesn't actually include any counties. The article that includes "countries" in the title does include counties.
So maddening. Both lessons need to be rewritten.
